Units

What it's for

The library works in metric internally: bar, metres, litres, degrees Celsius and litres per minute. The units module converts imperial input and output at the edges of your app. Conversions are plain arithmetic and do not validate their input.

Formulas

p_{p s i} = 14.5037738 p_{b a r}

d_{f t} = 3.280839895 d_{m}

V_{L} = 28.3168466 V_{f t^{3}}

T_{F} = \frac{9}{5} T_{C} + 32

$p_{p s i}$ , $p_{b a r}$ : pressure in psi and bar.
$d_{f t}$ , $d_{m}$ : depth in feet and metres.
$V_{L}$ , $V_{f t^{3}}$ : volume in litres and cubic feet. Flow rates use the same factor (L/min and cu ft/min).
$T_{F}$ , $T_{C}$ : temperature in degrees Fahrenheit and Celsius. Kelvin is $T_{K} = T_{C} + 273.15$ .

Assumptions and limits

Conversions do not validate input. NaN in gives NaN out.
Every conversion is available in both directions, as named helpers (psiToBar, mToFt, cuftToLitres) and as unit-string helpers (toBar, fromMeters, toLpm).
Unit strings are 'bar' | 'psi', 'm' | 'ft', 'l' | 'cf', 'lpm' | 'cfm' and 'C' | 'F'.

Sources

psi per bar: NIST SP 811 Appendix B (1 psi = 6.894757 kPa).
Litres per cubic foot: NIST SP 811 (1 ft³ = 28.316846592 L).
Feet per metre: the international foot, exactly 0.3048 m.
Kelvin offset: SI definition.

Examples

import { psiToBar, cuftToLitres, toLpm } from 'dive-math/units'
psiToBar(3000) // => 206.84
cuftToLitres(80) // => 2265.35
toLpm(1.5, 'cfm') // => 42.48

API

See the units API reference.

Units ​

What it's for ​

Formulas ​

Assumptions and limits ​

Sources ​

Examples ​

API ​